Add an option to configure permission on dump

[l00ptr]

We add an option / configuration item to define the permissions for the dumps created with pg_back. We reuse / configure the 0600 permissions by default to ensure some compatibility with the old (non configurable) approach.

We probably need to discuss and improve what we should do for the parent directory when using 'd' for the dump format. Currently we still apply the 0700 mode in such situation, but maybe we should define a specific option or reuse the one we add right now.

[l00ptr]

Hi @orgrim,

This MR try to implement #132

I still want to improve it before some feedback about the code itself, but I think we should discuss about what we should do whith the parent directory when using the 'd' format and also we should also handle the situation where pg_back users simply want pg_back to use/respect the umask. What do you think we should do about those cases ?

Best regards,
Julian

[orgrim]

Hi @l00ptr, thanks a lot for taking care of this.

After a quick look: some lead on the default mode and how to "handle umask" would be to keep the current 0o600 mode for compatibility and use a negative value use to let the umask apply, since it ends up being store as a integer. What do you think?

On the directory format, I need to confirm if we are currently consistent on the permissions of all extra files, as this question applies to checksum files and others as well. I would expect the mode to be set once and applied everywhere.

While I need to test the patch, it looks promising.

Regards

[l00ptr]

After a quick look: some lead on the default mode and how to "handle umask" would be to keep the current 0o600 mode for compatibility and use a negative value use to let the umask apply, since it ends up being store as a integer. What do you think?

Hi @l00ptr, thanks a lot for taking care of this.

After a quick look: some lead on the default mode and how to "handle umask" would be to keep the current 0o600 mode for compatibility and use a negative value use to let the umask apply, since it ends up being store as a integer. What do you think?

good idea, done within the fixup.

On the directory format, I need to confirm if we are currently consistent on the permissions of all extra files, as this question applies to checksum files and others as well. I would expect the mode to be set once and applied everywhere.

I'll also look into how checksums (files) are generated and written (and how file permissions are set for them).

While I need to test the patch, it looks promising.

Regards